I don’t know about you, but I have spent a lot of time customizing menus for each of my sites. Duplicating them manually is not the best way to use my time. Thanks to plugins like Duplicate Menu, it is much easier to duplicate simple and complex menus. This plugin is pretty easy to use. Just choose the menu you would like to clone and enter a name for it.
Duplicate Menu lets you create multiple copies of your complex menus to customize them faster. It retains the structure of the original menu. You can try this script for free.